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Reports unnecessarily escaped characters in <b>String</b> and optionally <b>char</b> literals.
For example <b>\'</b> in a <b>String</b> literal or <b>\n</b> in a Java 13 Preview text block.
The escaped tab character <b>\t</b> is not reported.
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<p><small>New in 2019.3</small>
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